Nitrogen and hydrogen are sealed in a container with a catalyst. The mixture reaches dynamic equilibrium.
Which statement about the mixture at equilibrium is correct?
All of the nitrogen and hydrogen have changed into ammonia.
No more ammonia is being made and none is breaking down.
There are equal amounts of nitrogen, hydrogen and ammonia.
Ammonia is still being made and is still breaking down.
47 exam-style questions on OCR GCSE Chemistry 5.3 Equilibria, covering 5.3.1 Reversible reactions and dynamic equilibrium and 5.3.2 Changing the position of equilibrium. Each one has a worked solution and a mark scheme showing where the marks go.